Unit 4 Natural disasters定语从句(Ⅰ)在复合句中，修饰某一名词、代词或整个主句的从句叫作定语从句。从句修饰的名词或代词叫作先行词，连接先行词和定语从句的词叫关系词。关系词的主要作用是连接主句和从句，同时指代先行词，并在从句中充当一定的句子成分。关系词分为关系代词和关系副词两种，关系代词有 that，which，who，whom，whose 等；关系副词有when，where，why。[观察例句]1. There were deep cracks that/which appeared in the well walls.2．Two thirds of the people who lived there were dead or injured.3．The number of people who were killed or badly injured in the quake was more than 400，000.4．Soon after the quakes，the army sent 150，000 soldiers to Tangshan to dig out those who were trapped and to bury the dead.5．Workers built shelters for survivors whose homes had been destroyed.6 ． A doctor with whom James used to work died in the 2016 earthquake in Ecuador.7．Mr.Li is an architect whose designs for the new town of Wenchuan have won praise.8．The supplies which were provided to the disaster area were collected from around the country.[归纳用法]一、关系代词的基本用法1．who 指人，在从句中作主语或宾语，作宾语时可省略。The man who is talking with my father is a teacher.正在和我父亲说话的那个人是个教师。The girl (who) I met yesterday was his sister.我昨天见到的那个女孩是他的妹妹。2．whom 指人，在从句中作宾语，常可省略，不能作主语。The boy(whom)the teacher often praises is their monitor.老师经常表扬的那个男孩是他们的班长。[名师点津] (1)关系代词 whom 在口语或非正式文体中常可用 who 来代替。The boy(who/whom/that)we saw yesterday was John's brother.昨天我们看到的那个男孩是约翰的哥哥。(2)在从句中作介词的宾语且直接跟在介词后时，用 whom，不用 who。He is a man from whom we are all ready to learn.他是我们大家都愿意学习的人。[即学即练 1]用关系代词填空①Do you know the man who is talking with your mother?②Those wh...
